[cairo] SSE support in pixman

[Jeff Muizelaar]

On Mon, Mar 10, 2008 at 11:20:14PM -0300, André Tupinambá wrote:
> +             /* pix_multiply */
> +             mulLo = _mm_mulhi_epu16 (xmmDstLo, xmmAlphaLo);
> +             mulHi = _mm_mulhi_epu16 (xmmDstHi, xmmAlphaHi);
> +             mulLo = _mm_adds_epu16 (mulLo, xmmMask0080);
> +             mulHi = _mm_adds_epu16 (mulHi, xmmMask0080);

> +             mulLo = _mm_adds_epu16 (mulLo, _mm_srli_epi16 (mulLo,8));
> +             mulHi = _mm_adds_epu16 (mulHi, _mm_srli_epi16 (mulHi,8));
> +             mulLo = _mm_srli_epi16 (mulLo, 8);
> +             mulHi = _mm_srli_epi16 (mulHi, 8);

The hunk above should be faster if you use something like:
> +             mulLo = _mm_mulhi_epu16 (mulLo, xmmMask0101);
> +             mulHi = _mm_mulhi_epu16 (mulHi, xmmMask0101);

i.e (a+a>>8)>>8 == (a*257)>>16


-Jeff